Mongevlin was the chief residence of Ineen Dubh, she was the daughter of MacDonnell, Lord of the Isles and mother of Red Hugh O'Donnell. The State Paper recording her possession of the castle: "From Cul-Mac-Tryan runs a bogg three myles in length to the side of Lough Foyle in the midst of the bog is a standing loughe called Bunaber here at Bunaber dwells O'Donnell's mother (Ineen Dubh M'Donnell). Three miles above Cargan stands a fort called McGevyvelin (Mongivlin) upon the river of Lough Foyle O'Donnell's mother's chief house". The castle was recorded by Captain Nicholas Pynnar in his Survey of the Escheated Counties of Ulster in 1619 where he wrote that Sir John Stewart had built a very strong castle at ‘Magerlin’ with a flanker at each corner. There had been a flag stone over the archway with the inscription 'J.S.-E.S.T.-1619' which went missing in the early eighteenth century. Though the account that the castle had been completed in 1619 is contradicted by a later Survey (in 1622) of the Escheated Counties of Ulster that reads; Sir John Stuart, assignee of the Duke of Lennox ‘has built a castle of lime and stone on the banks of the River Foyle 50’ x 25’ x 3½ stories, slated, with 4 flankers at the top thereof. And an iron door portcullis wise; the principal timber and joists of the floor being oak are laid but not boarded or the partitions made, the iron grates for the windows being within the castle ready to be set up’. There is a wonderful pencil drawing showing the castle at that time available here. King James visited here on his way to the siege of Derry in 1689. From here he sent a letter proposing surrender, it was rejected. The castle later became the property of The Hon. Elizabeth Hamilton whose eldest son, James, Earl of Abercorn, and Viscount Strabane erected a plaque in her memory in 1704. The castle is now in ruins with only a small proportion of it left standing. Porthall railway station Porthall railway station opened on 1 May 1848 and was part of the Great Northern Railway of Ireland system which ran from Belfast Great Victoria Street to Foyle Road railway station in Derry City via Portadown, Dungannon, Omagh, Victoria Bridge, Strabane, Porthall and St. Johnston. Goods trains stopped running via the station on 4 January 1965 with the line